.todos_list {
    width : 300px;
    height: auto;
    margin: 100px auto;
    background-color: #FFFFFF;
  }
  
  .todos_list header {
    width      : 100%;
    height     : 100px;
    box-shadow : 1px -1px 2px 2px rgba(0, 0, 0, 0.2), -1px 1px 2px 2px rgba(0, 0, 0, 0.2);
    text-align : center;
    font-size  : 24px;
    color      : blanchedalmond;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-sizing: border-box;
    padding: 20px 30px;
  }
  .todos_list  ul{
    padding: 0;
  }
  .todos_list  li{
    list-style: none;
    display: flex;
    flex: 1;
    justify-content: start;
    align-items: center;
    text-align: center;
    width: 100%;
    outline-width: 1px;
    outline-style: solid;
    outline-color: antiquewhite;
    height: 50px;
    
  }
  .todos_list  li .target{
    text-decoration:line-through;
  }
  .todos_list  li input{
    margin-right: 20px;
  }
  .todos_list  li label{
    margin-left: 15px;
  }
/* text-decoration:underline;     下划线

text-decoration:overline;    顶划线 

text-decoration:line-through;  删除线 */
